646589231 has 2 divisors, whose sum is σ = 646589232. Its totient is φ = 646589230.

The previous prime is 646589161. The next prime is 646589239. The reversal of 646589231 is 132985646.

646589231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646589231 - 2¹⁰ = 646588207 is a prime.

It is a super-2 number, since 2×646589231² = 836155267290342722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646589239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323294615 + 323294616.

It is an arithmetic number, because the mean of its divisors is an integer number (323294616).

Almost surely, 2^646589231 is an apocalyptic number.

646589231 is a deficient number, since it is larger than the sum of its proper divisors (1).

646589231 is an equidigital number, since it uses as much as digits as its factorization.

646589231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 646589231 is about 25428.1189040794. The cubic root of 646589231 is about 864.7212979409.

The spelling of 646589231 in words is "six hundred forty-six million, five hundred eighty-nine thousand, two hundred thirty-one".